MGMT 1030 Lecture Notes - Lecture 15: Pointing Device, Musical Keyboard, Sound
6 May 2018
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MGMT 1030 Tutorial 15 Notes – Audio data
Introduction
• Internally, the image drawn will depend on the application program being used.
• Paint packages provide tools that use the pointing device to create paintings in a
bitmap image form.
• Drawing packages provide tools that create and manipulate objects.
• In this case, the result is an object image.
• Sound has become an important component in modern computer applications.
• Sound is used as an instructional tool, as an element of multimedia presentations, to
signal events within the computer, and to enhance the enjoyment of games.
• Sound can be stored in digital form on CD-ROMs and other media and made available to
accompany a film clip, illustrate the nuances of a symphony, or reproduce the roar of a
lion.
• Sound can be manipulated in the computer to compose music and to create the sounds
of different musical instruments, even an entire orchestra.
• Sound is normally digitized from an audio source, such as a microphone or amplifier
• Although it is possible to purchase instrumentation that connects the computer directly
to a musical keyboard and synthesizer.
• For most users, the sound was previously digitized and provided on a CD-ROM or
downloaded from a Web site.
• Since the original sound wave is analog in nature, it is necessary to convert it to digital
form for use in the computer.
• The technique used is the same as that used for music CDs and many other types of
analog waveforms.
• The analog waveform is sampled electronically at regular time intervals.
• Each time a sample is taken, the amplitude of the sample is measured by an electronic
circuit that converts the analog value to a binary equivalent.
• The circuit that performs this function is known as an A-to-D converter.
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